Passing anonymous type variables as method parameters

Question

I have two class of A & B, I want to pass var type variable by a method Separation() that is in another class. I do some casting but I receive InvalidCastException error. Any idea how to fix this, please?

Class A{
       var products =from u in XDoc.Descendants("product")
            select new
            {
                Urunkod = u.Element("productId"),
                                UrunAdi = u.Element("title"),
            };

         XmlUrun.Separate(products);
       }

Class B{
            internal static void Separate(object products)
            {
                var o2 = CaseByExample(products, new
                {
                    Urunkod = "",
                    UrunAdi = "",
                });
            }
            public static T CaseByExample<T>(this object o, T type)
            {
                return (T)o;
            }
        }

This would be a good example of when to use dynamic types??? — IAbstract
– IAbstract, Commented Jun 6, 2012 at 2:18
I don't believe you can do that using anonymous lists. Perhaps you could create a DTO class to contain your productId and title values? — dreza
– dreza, Commented Jun 6, 2012 at 2:18
@dreza: I think that a DTO would be a better idea. Much better for type-safety! — IAbstract
– IAbstract, Commented Jun 6, 2012 at 2:19

StriplingWarrior · Accepted Answer · 2012-06-06 02:23:00Z

2

An anonymous type cannot be passed in a strong manner outside the scope of an individual method, because there is no way to represent it outside the method's scope.

You can either use a dynamic type (which I don't recommend), or create a named class to represent the type (which I do recommend).

public class A
{
    public void Foo()
    {
        var products =from u in XDoc.Descendants("product")
        select new C
        {
            Urunkod = u.Element("productId"),
                            UrunAdi = u.Element("title"),
        };
    }
}

public class B
{
    public void Bar(IEnumerable<C> cList)
    {
        foreach(var c in cList)
            Console.WriteLine(c.Urunkod);
    }
}

public class C
{
    public XElement Urunkod {get;set;}
    public XElement Urunkadi {get;set;}
}

answered Jun 6, 2012 at 2:23

StriplingWarrior

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